题目内容
简便算(写出简算过程)
(
-
+
)×36
8.5+8.5×99
2012×
.
解:(1)(
-
+
)×36,
=
36
36
36,
=16-9+6,
=13;
(2)8.5+8.5×99,
=8.5×(1+99),
=8.5×100,
=850;
(3)2012×
,
=(2011+1)×
,
=2011×
1×
,
=2010
,
=
.
分析:(1)(
-
+
)×36,运用乘法分配律进行简算;
(2)8.5+8.5×99,运用乘法分配律进行简算;
(3)2012×
,将原式转化为:(2011+1)×
,再应用乘法分配律进行简算.
点评:此题考查的目的是使学生运用乘法的运算定律,对分数、小数四则混合运算进行进步简算.
![](http://thumb.1010pic.com/pic5/latex/2766.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/7.png)
=
![](http://thumb.1010pic.com/pic5/latex/42762.png)
![](http://thumb.1010pic.com/pic5/latex/219550.png)
![](http://thumb.1010pic.com/pic5/latex/219900.png)
=16-9+6,
=13;
(2)8.5+8.5×99,
=8.5×(1+99),
=8.5×100,
=850;
(3)2012×
![](http://thumb.1010pic.com/pic5/latex/27783.png)
=(2011+1)×
![](http://thumb.1010pic.com/pic5/latex/27783.png)
=2011×
![](http://thumb.1010pic.com/pic5/latex/517127.png)
![](http://thumb.1010pic.com/pic5/latex/27783.png)
=2010
![](http://thumb.1010pic.com/pic5/latex/517128.png)
=
![](http://thumb.1010pic.com/pic5/latex/517129.png)
分析:(1)(
![](http://thumb.1010pic.com/pic5/latex/2766.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/7.png)
(2)8.5+8.5×99,运用乘法分配律进行简算;
(3)2012×
![](http://thumb.1010pic.com/pic5/latex/27783.png)
![](http://thumb.1010pic.com/pic5/latex/27783.png)
点评:此题考查的目的是使学生运用乘法的运算定律,对分数、小数四则混合运算进行进步简算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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